I accidentaly linked wrong battle.net account with my steam and now can't unlink it. It says that my account has been migrated. Is there any way for me to undo the migration and link my steam with my actual battle.net account or do I have to create a new steam profile?
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The migration is a one-time process and cannot be reversed. In order to migrate the correct Battle.net, you do need to create another Steam account and migrate to that.